MET SF Flashcards
An aircraft is en-route at FL150 over mountainous terrain with an OAT of -25C. The MSA (minimum sector altitude) in this region is 10,000ft and the local QNH is 998hPa. The aircraft will have an actual clearance above MSA of [ ].
[3950ft].
On a very cold day, an aircraft is circling level with the top of a mountain peak using the QNH 1009. The altimeter will read
Select one:
- the same as the elevation of the peak
- not enough information to tell
- higher than the elevation of the peak
- lower than the elevation of the peak
- higher than the elevation of the peak
An aircraft is over Spain at FL280 temp -35 degrees. The ISA deviation is [ ].
[+6]
The pressure lapse rate (thickness between pressure levels) varies and will be affected by
[ ] changes in the atmosphere.
[temperature]
Given that the Transition Altitude (TA) is 13000ft, Transition Level (TL) is FL155, QNH 983. What is the thickness of the transition layer? (assume 30ft or 9m/hpa)
a. 1600 ft
b. 2500 ft
c. 3400 ft
d. 1900 ft
a. 1600 ft
If an aircraft is flying at FL180 in air temperature -35°C, the air density
[ ] in ISA.
[is likely to be greater than]
Below FL290 the standard vertical separation between FLs is 2000ft. On a given day, if the actual layer thickness is 1840ft how does the air temperature deviate from ISA? The OAT will be
[ ].
[ISA -20]
In Paris on a February evening the METAR is as follows: 121750 240/05 1200 OVC010 03/M01 Q1003. It can be assumed that the overnight temperature will [ ] [ ] 3 degrees C.
[fall] [slightly below]
Regarding pre-flight weather information available to crew, for a planned flight at FL170 the [ ] chart would be the most useful.
500 hpa
For an airport situated 100ft below MSL, the QFE will be [ ] QNH
[greater than]
An aircraft is on approach to land at an aerodrome in the Southern hemisphere where the wind at 3000ft is 060/30 kts. In the final stages of the approach, the surface wind is likely to be [ ] degrees at [ ] kts.
[090] [15]
During an approach to land an aircraft experiences a headwind at 4000ft followed by an increasing crosswind component from the right in the friction layer. The wind shift
a. is typical in the southern hemisphere
b. is typical in the northern hemisphere
c. results from a cold front advection in the southern hemisphere
d. results from a warm front advection in the southern hemisphere
a. is typical in the southern hemisphere
Which of the following is an example of a Foehn wind?
a. Ghibli
b. Chinook
c. Bora
d. Harmattan
b. Chinook
At an airfield situated parallel to the south coast of UK on a cloudless summer afternoon, which hazard is most likely to affect an aircraft low on the approach:
a. a strong land breeze blowing more or less perpendicular to the runway
b. a sea breeze blowing more or less perpendicular to the runway
c. variations in wind speed and direction at the surface due to a subsidence inversion typical for summer anticyclones
d. a radiation inversion due to surface cooling during the clear night
b. a sea breeze blowing more or less perpendicular to the runway
A north-south polar front jet stream is blowing at FL310 with Shannon to the west and Amsterdam to the east. An aircraft flying from Amsterdam to Shannon at FL320 would most likely experience the worst turbulence
[ ] crossing the core of the jet stream.
[before]
In mountainous regions a
[ ] wind is likely to develop
[ ] due to [ ].
[katabatic] [at night] [radiative cooling]
The Harmattan is a
a. warm southerly dust-bearing wind from the coast of North Africa
b. SW monsoonal wind causing extensive areas of advection fog along the West African coast south of 15°N
c. localised depression giving squally winds
d. NE wind affecting north-west Africa during November to April, reducing visibility in rising dust
d. NE wind affecting north-west Africa during November to April, reducing visibility in rising dust
An aircraft flying at FL240 on the northern hemisphere is experiencing a tailwind. The aircraft is
a. flying towards a low pressure area
b. flying with low pressure on its right
c. flying with low pressure on its left
d. flying towards a high pressure area
c. flying with low pressure on its left
In summer in the northern hemisphere the maximum wind speeds associated with subtropical jet streams are usually located
a. Above the tropopause at about 250hPa
b. Below the tropopause at about 200hPa
C. Below the tropopause at about 300hPa
d. Above the tropopause at about 100hPa
b. Below the tropopause at about 200hPa
An aircraft flying from North to South in the Northern Hemisphere crosses the Polar Front Jetstream just above the core. The outside air temperature will [ ].
[decrease]
What is true of the relationship between temp and dewpoint?
a. Humid air has a high dew point temperature relative to the air temperature
b. High cloud is likely when surface air temperature and dewpoint are close together
C. Dry air has a high dew point temperature relative to the air temperature
a. Dewpoint is always higher than temperature
a. Humid air has a high dew point temperature relative to the air temperature
What is the state of atmospheric stability when the temperature at 2000ft is +15 degrees C and at 5000ft is +3 degrees C?
Select one:
- Absolutely stable
- Absolutely unstable
- Conditionally unstable
- Conditionally stable
- Absolutely unstable
The outside temperature is +30°C and the dew point is +21 °C. Calculate the relative humidity.
a. 55%
b. 65%
c. 45%
d. 75%
a. 55%
An aerodrome situated on top of hill with a 500ft elevation is reporting fog; a nearby aerodrome with an elevation of 200ft is reporting visibility 8000m.
What is the most probable reason for the difference in conditions?
a. An upslope wind
b. Convective activity
c. The passage of a cold front
d. Surface cooling by terrestrial radiation
a. An upslope wind
From the situations described below, in which would the highest cloud tops most likely be found?
a. Near an occlusion point
b. Along a mid-latitude cold front x
c. A tropical cyclone
d. A polar low in winter
c. A tropical cyclone
[ ] fog is likely to form when a stable air mass having a temperature of -25°C passes over an ice free ocean having a temperature of +1°C?
[steam]
The type of cloud formed when warm, light air rises rapidly into cooler air is:
a. stratocumulus
b. nimbostratus
c. cumulus
d. stratus
c. cumulus
The expected flight conditions in Cirriform cloud are [ ] and [ ].
[no airframe icing] [visibility greater than 1000m]
“A slight obscuration of the lower atmosphere, typically caused by fine suspended particles of a solid nature” is a description of [ ].
[haze]
On a relatively clear and calm evening in early winter, you receive the ATIS for your arrival into Geneva and notice that the temperature and dew point are 1 degree C and minus 1 degree C respectively. What is most likely to occur over the course of the night and into the early morning?
a. the wind is likely to strengthen
b. radiation fog is likely develop
c. cloud will form
d. precipitation is likely
b. radiation fog is likely develop
“When rain, falling from relatively warm air, evaporates into cooler air close to the surface and causes it to become saturated”.
The definition above describes [ ] fog.
[frontal]
In a warm cloud, according to the coalescence theory, precipitation will form by
a. droplets joining together if they have the same electrical charge
b. droplets joining together beneath the cloud
c. droplets joining together with ice crystals
d. droplets joining together in the cloud
d. droplets joining together in the cloud
In mid-latitudes, the intensity of precipitation associated with low level stratus is typically [ ].
[light]